Accession Number : AD0753269

Title :   Resolution of Motions in the Three Solid Phases of Methylammonium Chloride (CH3NH3Cl) by NMR.

Descriptive Note : Technical rept.,

Corporate Author : ILLINOIS UNIV URBANA NOYES CHEMICAL LAB

Personal Author(s) : Albert,Shmuel ; Ripmeester,John A.

Report Date : 06 SEP 1972

Pagination or Media Count : 25

Abstract : The alpha, beta, and gamma phases of solid methylammonium chloride (CH3NH3Cl) and its partially deuterated analogs (CD3NH3Cl) and CH3ND3Cl) were investigated using temperature dependent static and rotating frame proton spin-lattice relaxation times, T(1) and T(1rho), respectively. Broadline proton magnetic resonance studies were performed in the supercooled gamma phases. It was found that partial deuteration causes the beta to gamma transition temperature to shift to higher temperatures. The motions in the three modifications of these substances were analyzed using the spin-lattice relaxation data and the second moments for the supercooled gamma phase. A resolution of the CH3 and NH3(+) rotations about the C-N axes was accomplished. The NMR results pertaining to the three phases of these compounds are discussed and related to other studies. (Author)

Descriptors :   (*AMMONIUM COMPOUNDS, *PHASE STUDIES), (*NUCLEAR MAGNETIC RESONANCE, AMMONIUM COMPOUNDS), SALTS, CHLORIDES, DEUTERIUM COMPOUNDS, RELAXATION TIME, ROTATION, CHEMICAL BONDS

Subject Categories : Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE